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Congruence and Transformations in Geometry Quiz

#1

Which transformation does not change the size or shape of a figure?

Translation
Explanation

Translation moves each point the same distance in the same direction, preserving size and shape.

#2

What transformation occurs when a figure is flipped over a line?

Reflection
Explanation

Reflection involves flipping a figure over a line, changing its orientation.

#3

What is the result of rotating a figure 90 degrees counterclockwise about the origin?

90-degree rotation
Explanation

A 90-degree counterclockwise rotation turns a figure by a right angle.

#4

What transformation occurs when a figure is moved along a straight line without changing its shape or size?

Translation
Explanation

Translation involves moving a figure along a straight line, preserving its shape and size.

#5

What transformation occurs when a figure is stretched or compressed?

Dilation
Explanation

Dilation stretches or compresses a figure, altering its size.

#6

What is the result of rotating a figure 180 degrees counterclockwise?

180-degree rotation
Explanation

A 180-degree rotation turns a figure halfway around, changing its orientation.

#7

Which of the following transformations changes the size of a figure?

Dilation
Explanation

Dilation alters the size of a figure without changing its shape.

#8

If a figure is translated 3 units to the right and 4 units down, what is the translation vector?

(4, 3)
Explanation

The translation vector for this movement is (4, 3), representing the horizontal and vertical shifts.

#9

What is the image of point (2, 3) under a reflection across the x-axis?

(2, -3)
Explanation

Reflection across the x-axis negates the y-coordinate, resulting in (2, -3).

#10

What is the image of point (5, -2) under a reflection across the y-axis?

(-5, 2)
Explanation

Reflection across the y-axis negates the x-coordinate, resulting in (-5, 2).

#11

What is the name of a transformation that moves each point of a figure the same distance in the same direction?

Translation
Explanation

Translation preserves size and shape by moving every point the same distance and direction.

#12

Which of the following transformations preserves both distance and angle measures?

Rotation
Explanation

Rotation maintains both distance and angle measures, keeping the shape intact.

#13

What is the transformation matrix for a dilation with a scale factor of 2?

[[2, 0], [0, 2]]
Explanation

The dilation matrix with a scale factor of 2 is [[2, 0], [0, 2]], stretching the figure in both dimensions.

#14

If a figure is rotated 270 degrees counterclockwise about the origin, what are the coordinates of point (3, -4) after the rotation?

(-4, -3)
Explanation

A 270-degree counterclockwise rotation swaps x and y and negates the new x-coordinate, resulting in (-4, -3).

#15

What transformation matrix represents a reflection across the line y = x?

[[0, 1], [1, 0]]
Explanation

The reflection matrix across y = x is [[0, 1], [1, 0]], swapping x and y coordinates.

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